Abstract

Helium ion backscattering is used to study the sorption of CO on W(100), Ni(110), and Ni(111) surfaces. It is concluded that the CO molecular axis is oriented normal to the Ni(110) and Ni(111) surfaces. The molecular orientation of CO on W(100) is more complicated, depending on the temperature. No orientation for CO molecules can be obtained at room temperature while at higher temperatures, CO appears to be either oriented parallel to the surface or dissociated.

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